1.If a magnet is moved into a coil of wire a current is induced in the wire. 2.If the magnet is moved out of the coil the direction of the current is reversed 3.A wire, or coil of wire, cutting through a magnetic field will generate a voltage. This induced voltage causes a current to flow through the wire Electromagnetic Induction

The size of the induced voltage can be increased if; the wire is moved faster the magnet is stronger the number of turns on the coil is increased the area of the coil is greater Increasing the voltage

1.Electricity is generated by rotating a coil of wire in a magnetic field or by rotating a magnet inside a coil of wire. This is how a generator works Generators and Dynamos

Generating Electricity

Generator Generator

Dynamo Dynamo

1.Transformers can be used to change the voltage of an a.c. supply. 2.A changing magnetic field in the primary coil induces a voltage in the secondary coil 3.Transformers only work with alternating voltage Transformers Transformers

Transformers

1.Step-up transformers produce high voltages so that little energy is lost in power lines (National Grid) 2.Step-down transformers reduce voltages before the electricity reaches our homes 3.Primary voltage/Secondary voltage = Number of turns on primary/Number of turns on secondary Step-up & Step-down Transformers Transformers

Step-up & Step-down Transformers Transformers

Step up Transformer Step up transformer

Step down Transformer Step down transformer